Improvement in nut-locks



R.. LONG.

NUT-LOCK.

Patented Nov. 9, 1875.

Fly .2.

NJHERS, PMDTLxTHOGRAFHER. WASNINGTDN. D C,

. of the accompanying drawing.

rE S'rnfrus RICHARD LONG, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN NUT-LOCKS.

Specircation forming part of Lettere Patent No. 169,647, dated November 9, 1875; application tiled Y August 4, 1875.

To all whom it may concern:

Be it known that I, RicHARD LONG, of the city of Pittsburg, county of Allegheny,` State of Pennsylvania, have invented an Improvement in Bolts and Nut-Locks, of which the following is a speciiication:

The object of my invention is to provide a cheap, simple, and efficient nut-lock, so constructed as to entirely overcome the great difficulty heretofore encountered in locking or fasteninganut uponabolt, Where both are subjected to great and continuous jarring or concussion, in such a manner as to keep the nut at all times perfectly tight in its place. In order to accomplish this I have constructed a screwthreaded bolt, with a neck formed on one end about equal or a little less in diameter than the body of the bolt, and having a conical recess countersunk in the same end; and I have also invented a punch of peculiar construction, to be used in connection therewith in securing the nut in place, having a cup-shaped recess in one end thereof, from the center ot' which a stem or projection rises, as will behereinafter more fully set forth.

A represents a screw-threaded bolt, having a smooth neck, a, formed on one end thereof, and a conical recess, b, countersunk in the same end, as shown in side view in Figure l This bolt is passed through any device or devices that are to be screwed together, as represented by the plates B Bf, Fig. 2, and a nut, C, of the usual construction, is screwed on the end thereof, with its outer face flush With the base of the last thread on the end of the bolt. A washer, D, of wrought-iron or other suitable metal, is then placed on the neck of thebolt, jam against the outer face of the nut C; and a punch, E, having a cup-shaped recess, c c, in its end, from the center of which a central stem or projection, d, rises,having its end cut square or straight oft', but with its edges slightly beveled to prevent its cutting the metal, as shown in Fig. 3, is then applied to the recessed end of the bolt, the end of the projection (l resting in the recess b, on a line slightly in advance 0r on the outside of the face of the washer D,

as shown in Fig. 4. The outer end of the punch E is then struck with a hammer, which forces the projection d farther into the recess b, and causes the beveled edges ofthe projection to force or expand the metal of the neck a out over the hole in the Washer D, thereby forming an annular rib or projection, e, on the neck of the bolt in front of the Washer, as clearly shown in Fig. 2, While, at the same time, the outer end ot' the neck of the holt is firmly held in the recess in the end ot' the punch, between the projection d and the outer rim ot' the punch, thus preventing the outer end of the neck from splitting or spreading while the annular rim is being expanded.

In case the outer end of the screwthread should project beyond the outer face of the nut when the latter is screwed home, a Washer large enough to go over the thread should be put on, so as to give an even bearing for the locking-washer to rest against; but it is pret'- erable to have the locking-washer t directly against the face of the nut, and this can always be done, even if the bolt should be too long, by putting Washers on the end of the bolt, against its head.

Where a nut is dispensed with, and a plate or bar is used instead, the latter is provided with screw-threaded holes l'or the bolts, and the screw-threads on the bolts come out iiusll with, but not beyond, the outer face of the bar or plate, and the locking-washer is applied and riveted against the face of the plate, in the manner already described.

By this method of fastening the nut it is et'- fectually prevented from ever Working loose, while at the same time it can be removed, when desired, by applying extra torce with a wrench, in such a manner as not to injure either the bolt or nut, as by turning the bolt or nut the annular rib is forced back into the countersunk space in the neck of the bolt, and as this neck is ot' a smaller diameter than the body or threaded portion of the bolt, it can be Withdrawn through theV nut without injuring in any manner the screw-thread ot' the nut. In this Way the bolt and nut can be used as many times as maybe desired.

Having thus fully described my invention, 2. The punch E, having the cup-shaped rewhat I desire to secure by Letters Patent cess c c and the central stem or projection d, issubstantially in the manner and for the pur- 1. The bolt A, having the smooth neck a pose set forth. n

formed on the end thereof7 and the conical RICHARD LONG. recess b, also in the end of the neck, substan Witnesses: tially in the 'manner and for the purpose set- THOMAS C. CONNOLLY, forth. HENRY H. BURTON. 

